Gulu is the puzzle game with a simple rule, but it's not so easy to be solved.You should put all squares back to their origninal positions. However, every step you move will also affect other adjacent 3 squares.As a Rubik's cube, you can figure out some formulas that can slove all puzzles. moreover, you can just randomly shuffle them for relaxing.

Go to: http://store.steampowered.com/ and download STEAM client Click "Install Steam" (from the upper right corner) Install and start application, login with your Account name and Password (create one if you don't have). Please follow these instructions to activate a new retail purchase on Steam: Launch Steam and log into your Steam account. Click the Games Menu. Choose Activate a Product on Steam... Follow the onscreen instructions to complete the process. After successful code verification go to the "MY GAMES" tab and start downloading.